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Commitments and Contingencies - Oil Creek Fire (Details) (Oil Creek Fire [Member], Loss from Catastrophes [Member], USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Minimum [Member]
 
Loss Contingencies [Line Items]  
Insurance Coverage Deductible Per Occurrence $ 1.0
Maximum [Member]
 
Loss Contingencies [Line Items]  
Loss Contingency, Damages Sought, Value $ 50